438 ALGÆ OF TASMANIA. 
these true apices.— This is a very noble and most distinctly 
characterised species, which probably will mark an Australian 
section of the genus, distinguished by having dichotomous 
ultimate ramuli terminating in single-tubed filaments. 1 
have great pleasure in inscribing it to its discoverer, Mr. 
Gunn, to whom the botany of V. D. Land stands so largely 
indebted. 
11. Polysiphonia Lawrenciana, Harv.; caule longissimo ; 
crasso, inarticulato, striato, alterné ramosissimo; ramis 
primariis, secundariis, tertiariisque inarticulatis ; tertiariis 
ramulis dichotome multifidis roseis pinnatis ; ramulis con- 
gestis, globoso-penicillatis, parum attenuatis multifidis, in 
filis monosiphoniis dichotomis roseis desinentibus ; articu- 
lis ramulorum diametro equalibus, filarum sesquilongiori- 
bus; stichidiis lanceolatis mucronatis, ad apices ramu- 
lorum. 
George Town, V. D. L., A. Gunn, Esq., n. 1268.—Stem 
8-10 inches long or more, thicker than bristle below, about 
as thick above, excessively branched in an alternate manner, 
in all parts opake, veiny, and therefore seemingly striated, 
without any external indications of joints. Branches of the 
first, second, and third orders alternate, erecto-patent, rather 
distant, all inarticulate; those of the third order pinnated 
with dichotomously multifid glomerate or pencilled ramuli, 
each pencil 1-2 lines in breadth, closely circumscribed and 
somewhat globular, consisting of a robust main trunk set 
with four or five distichous once-forked many-tubed ramuli —— 
which terminate in a pencil of dichotomously multifid on — — 
tubed attenuated coloured filaments. Substance seemingly — 
rigid, and only imperfectly adhering to paper. Colour à fine 
crimson. Stichidia lanceolate, terminating the forked ramu x 
containing tetraspores.—' The strong affinity which exo 5 
between this plant and P. Gunniana induces me to dedicate — 
it to the memory of the late R. W. Lawrence, Esq., the intimate — 
friend and accomplished fellow-labourer in botany of Mr. 
Gunn. It differs from P. Gunniana in the more rigid sub- 
stance, inarticulate lesser branches, and small and very dense. 
